One of Australia's most notorious scam artists is continuing to run a business that rips off vulnerable students while he is out on bail appealing his conviction and sentence.

Key points:

ABC investigation uncovers evidence a convicted fraudster is continuing to take tens of thousands of dollars off foreign students

He promises them visas and jobs, but they never eventuate and one woman found herself deported without a visa

Students say federal immigration authorities have failed to act against Eddie Kang despite complaints, which Kang says are "unfounded"

Eddie Kang was sentenced to 12 months in prison in March 2017 after he was convicted of 22 counts of fraud and misleading conduct involving 11 foreign students who paid his companies to secure 457 visas.

The jobs and the visas never eventuated, and the Korean-born businessman refused to refund the students' money including payments worth tens of thousands of dollars.

One of Kang's bail conditions states he must not "file any visa applications using a company of which he is sole director".

An ABC investigation has uncovered evidence the convicted fraudster continues to take money off foreign students under the false promise he will secure them visas and sponsored employment.

"I think he is just laughing at the Australian community and the Australian laws," Karl Konrad, a migration agent who claims up to a hundred of Kang's clients had come into his office seeking help, said.

The ABC has spoken to 10 people who said they had signed contracts with Kang since he was convicted of fraud.

Many have handed over their life savings. All were unaware of his convictions at the time and are dismayed that Australian authorities have allowed him to continue to run his operation while he is out on bail.

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One of Kang's recent victims deported

Marjan Nabavi signed a contract with Kang six months after the Sydney businessman was sentenced to prison. His distinctive signature graces each page of the contract.

Ms Nabavi had lived in Australia for six years. Two of her brothers have citizenship and she was desperate to stay.

When the Iranian's visa application was rejected she searched online for migration agents to help with her appeal. She soon found herself in Kang's office in North Sydney.

"He said 'I'll give you a guarantee that we will find a job and you will get citizenship'," she said.

"He said, 'In case you don't like the job we will give your money back'."

That name was soon retired, and Kang continued operating under other names such as RSMS Australia and ARVS.

While Kang has been able to trick foreign students who may have poor English skills, little understanding of Australian consumer law or have been in the country for a short time, he has also been able to get past authorities.

While the NSW Office of Fair Trading led the prosecution against Kang that saw him convicted of fraud, international students and migration agents have told the ABC the federal department responsible for immigration has ignored their complaints.

Sydney migration agent Mr Konrad has been making complaints to the federal government since 2013.

In a statement, the Department of Home Affairs said the matter was before the courts and investigations were underway.

"The Australian Border Force (ABF) continues to provide assistance to the NSW Department of Fair Trading who have commenced proceedings on these matters under the Consumer Law," the statement said.

"The ABF continues to refer alleged victims of Mr Kang to the NSW Department of Fair Trading."

ABC coverage 'witch-hunting fake news', Kang says

Kang refused to be interviewed by the ABC.

In an email he said this story was part of a pattern of "unfounded accusations and untrue reportings".

"This type of witch-hunting fake news must be disappeared from earth," he said.

"Danger is that your initial fake reports will be spreading like epidemics thru [sic] google and youtube on the internet, and finally becoming facts pretending that is true, being believed by public, harassing and haunting too many honest victims for their entire lives, destroying their lives."

In 2009 Kang's immigration consulting company across the ditch was put into liquidation by order of New Zealand's High Court.

The liquidator's report found Kang to be "dishonest" and said that many members of the local Korean community had claimed to "have lost large sums of money" in dealings with Kang.

The report recommended Kang "should not be operating a business in New Zealand".